I thought you were...
...a helicopter!
That's a new one for me. When I walk around the edges of daylight, I always wear flashing lights - three blue lights facing forward, and two red ones facing backward. I've had people tell me how visible I am, and I've had people tell me that they thought I was a police car - but a helicopter?
I was on a relatively dark road, when I crossed paths with a couple and their dog. I said hello, and the woman said "I thought you were a helicopter"! Given that I am not that big, I guess it would have been a helicopter landing in a residential neighborhood. A little odd, but an interesting trick of the mind.
That comment definitely brought a smile to my face!